GNU bug report logs - #18326
24.4.50; allow-no-window for async-shell-command in temp buffer

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Joe Corneli <holtzermann17 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.4.50; allow-no-window for async-shell-command in temp buffer
Date: Sun, 24 Aug 2014 19:34:21 +0100

The docs for `async-shell-command' say:

(async-shell-command COMMAND &optional OUTPUT-BUFFER ERROR-BUFFER)
  [...]
  To run COMMAND without displaying the output in a window you can
  configure `display-buffer-alist' to use the action
  `display-buffer-no-window' for the buffer `*Async Shell Command*'.

Referring to further docs and a recent discussion on this list,
https://lists.gnu.org/archive/html/bug-gnu-emacs/2014-07/msg00935.html
I see that that boils down to a setting like this:

(setq display-buffer-alist 
      '(("\\*Async Shell Command\\*" . (display-buffer-no-window
      . ((allow-no-window . t))))))

So, I've made that setting, expecting that it means that the Async Shell
Command buffer will not appear.  But then, defining the following
function and running the snippet that follows gives me an error:

(defun sudo-shell-command (command)
  (interactive "MShell command (root): ")
    (with-temp-buffer
      (cd "/sudo::/")
      (async-shell-command command)))

(sudo-shell-command "touch /dev/null")

  byte-code: Wrong type argument: window-live-p, nil

...Is that really to be expected?

As a work-around: if I return to the default setting for
`display-buffer-alist' and define my function this way, there is
no error and, as desired, the buffer doesn't display:

(setq display-buffer-alist nil)

(defun sudo-shell-command (command)
  (interactive "MShell command (root): ")
  (save-window-excursion
    (with-temp-buffer
      (cd "/sudo::/")
      (async-shell-command command))))

(sudo-shell-command "touch /dev/null")

I get the message:

  nil: finished.

I might have expect to see:

  touch /dev/null: finished.

but at least there's no error!





In GNU Emacs 24.4.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2014-08-09 on Teacup
Repository revision: 117674 rrt <at> sc3d.org-20140809165943-i667kjxzdst2ey4c
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04.1 LTS

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Recent messages:
nil: finished.
https://lists.gnu.org/archive/html/bug-gnu-emacs/2014-07/msg00935.html
Mark set
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You can run the command `about-emacs' with C-h C-a
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https://lists.gnu.org/archive/html/bug-gnu-emacs/2014-07/msg00935.html
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Message #8 received at 18326 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Joe Corneli <holtzermann17 <at> gmail.com>
Cc: 18326 <at> debbugs.gnu.org
Subject: Re: bug#18326: 24.4.50;
 allow-no-window for async-shell-command in temp buffer
Date: Mon, 25 Aug 2014 11:03:24 -0400

> (setq display-buffer-alist 
>       '(("\\*Async Shell Command\\*" . (display-buffer-no-window
>       . ((allow-no-window . t))))))

The allow-no-window option should be passed by the *caller*.
You shouldn't need it and don't want it here.


        Stefan

Message #11 received at 18326 <at> debbugs.gnu.org (full text, mbox):

From: Joe Corneli <holtzermann17 <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 18326 <at> debbugs.gnu.org
Subject: Re: bug#18326: 24.4.50; allow-no-window for async-shell-command in
 temp buffer
Date: Tue, 26 Aug 2014 23:59:29 +0100

Hi Stefan:

I tried this:

(setq display-buffer-alist
      '(("\\*Async Shell Command\\*" . (display-buffer-no-window . nil))))

(defun sudo-shell-command (command)
  (interactive "MShell command (root): ")
    (with-temp-buffer
      (cd "/sudo::/")
      (async-shell-command command)))

(sudo-shell-command "touch /dev/null")

The buffer still pops up.

The docs say:

(async-shell-command COMMAND &optional OUTPUT-BUFFER ERROR-BUFFER)
[...]
To run COMMAND without displaying the output
in a window you can configure `display-buffer-alist' to use the action
`display-buffer-no-window' for the buffer `*Async Shell Command*'.

OK, would be be able to tell me how I do that?  It seems that I've now
tried two seemingly sensible ways to do this configuration, and the
docs led me to the previous configuration, and not clearly to anything
else.


display-buffer-alist is a variable defined in `window.el'.
[...]
This is a list of elements (CONDITION . ACTION), where:

 CONDITION is either a regexp matching buffer names, or a
  function that takes two arguments - a buffer name and the
  ACTION argument of `display-buffer' - and returns a boolean.

 ACTION is a cons cell (FUNCTION . ALIST), where FUNCTION is a
  function or a list of functions.  Each such function should
  accept two arguments: a buffer to display and an alist of the
  same form as ALIST.  See `display-buffer' for details.

(display-buffer-no-window BUFFER ALIST)
[...]
Display BUFFER in no window.
If ALIST has a non-nil `allow-no-window' entry, then don't display
a window at all.

Message #14 received at 18326 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Joe Corneli <holtzermann17 <at> gmail.com>
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 18326 <at> debbugs.gnu.org
Subject: Re: bug#18326: 24.4.50;
 allow-no-window for async-shell-command in temp buffer
Date: Tue, 26 Aug 2014 19:31:13 -0400

The example from http://debbugs.gnu.org/13594#185 works for me.

(add-to-list 'display-buffer-alist '("\\*Async Shell Command\\*"
                                     display-buffer-no-window (nil)))

Message #17 received at 18326 <at> debbugs.gnu.org (full text, mbox):

From: Joe Corneli <holtzermann17 <at> gmail.com>
To: Glenn Morris <rgm <at> gnu.org>
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 18326 <at> debbugs.gnu.org
Subject: Re: bug#18326: 24.4.50;
 allow-no-window for async-shell-command in temp buffer
Date: Thu, 28 Aug 2014 07:42:38 +0100

Glenn Morris writes:

> The example from http://debbugs.gnu.org/13594#185 works for me.
>
> (add-to-list 'display-buffer-alist '("\\*Async Shell Command\\*"
>                                      display-buffer-no-window (nil)))

Using that snippet, I'm still seeing a window pop up containing the
contents of /etc/shadow when I run:

emacs -Q -l start-up.el
M-x sudo-test RET
<password> RET

where start-up.el contains the following code:

(add-to-list 'display-buffer-alist '("\\*Async Shell Command\\*"
                                     display-buffer-no-window (nil)))

(defun sudo-shell-command (command)
  (interactive "MShell command (root): ")
  (with-temp-buffer
    (cd "/sudo::/")
    (async-shell-command command)))

(defun sudo-test ()
  (interactive)
  (sudo-shell-command "cat /etc/shadow"))

Message #20 received at 18326 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Joe Corneli <holtzermann17 <at> gmail.com>
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 18326 <at> debbugs.gnu.org
Subject: Re: bug#18326: 24.4.50;
 allow-no-window for async-shell-command in temp buffer
Date: Thu, 28 Aug 2014 11:45:05 -0400

Works for me without sudo (eg cd /tmp instead). Maybe it's a sudo/tramp thing.

Message #23 received at 18326 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Glenn Morris <rgm <at> gnu.org>
Cc: Joe Corneli <holtzermann17 <at> gmail.com>, 18326 <at> debbugs.gnu.org
Subject: Re: bug#18326: 24.4.50;
 allow-no-window for async-shell-command in temp buffer
Date: Thu, 28 Aug 2014 21:33:03 +0200

Glenn Morris <rgm <at> gnu.org> writes:

> Works for me without sudo (eg cd /tmp instead). Maybe it's a sudo/tramp thing.

`tramp-handle-shell-command' didn't use `display-buffer'. I've changed
that in the trunk.

Best regards, Michael.

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